...H.J. Hulsebosch; M.P. Ponec-Waelsch When anthralin is applied with a zinc oxide paste as vehicle its antipsoriatic activity decreases in less than 3 weeks. Laboratory experiments make it probable that this deterioration is due to an interaction between anthralin and hydrolyzed zinc oxide molecules...

...R.D. Juch; T. Rufli; C. Surber Background: Pastes are semisolid stiff preparations containing a high proportion of finely powdered material. Powders such as zinc oxide, titanium dioxide, starch, kaolin or talc are incorporated in high concentrations into a preferably lipophilic, greasy vehicle...